Images in printed pdfs

Hi all,

I'm generating pdfs through cfdocument... if the pdf contains an image with a white background, it doesn't appear as white when printed in B&W. Instead, it has a slightly grainy grey appearance; you can see the outline of the image instead of seamlessly blending with the white page.

If I print the image directly, it comes out as white. If I print the html template (i.e., not passed to a cfdocument), it comes out white. Only after being processed as a pdf through cfdocument does the image appear with the grey background.

Has anyone come across this issue?

Thanks,